- Bone is a living tissue that is constantly being remodeled through the removal and replacement of old bone tissue with new bone tissue. - Peak bone mass, the maximum bone density achieved, is reached in the mid-20s; achieving a high peak bone mass through adequate calcium/vitamin D intake and weight-bearing exercise in childhood and adolescence can reduce osteoporosis risk later in life. - Factors like diet, exercise, hormones, genetics, and body weight can affect bone strength; adequate calcium from foods like dairy along with vitamin D and regular weight-bearing activity are especially important for developing strong bones.